Thank you for posting this in Microsoft Q&A.
I understand that you are looking for information about the availability of Federation to EntraID Workforce tenants and Impersonation features in EntraID External tenant.As of today, we do not have any information about the availability of these features in EntraID External tenant.
Appreciate if you could share the feedback on our feedback channel. Which would be open for the user community to upvote & comment on. This allows our product teams to effectively prioritize your request against our existing feature backlog and gives insight into the potential impact of implementing the suggested feature. https://feedback.azure.com/d365community/forum/22920db1-ad25-ec11-b6e6-000d3a4f0789which is closely monitored by our product team.
Hope this helps. Do let us know if you any further queries.
Thanks,
Navya.
If the answer is helpful, please click "Accept Answer" and kindly "upvote" it.